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  2. Hill cipher - Wikipedia

    en.wikipedia.org/wiki/Hill_cipher

    Hill's cipher machine, from figure 4 of the patent. In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra.Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical (though barely) to operate on more than three symbols at once.

  3. Polygraphic substitution - Wikipedia

    en.wikipedia.org/wiki/Polygraphic_substitution

    This was followed up over the next fifty years with the closely related four-square and two-square ciphers, which are slightly more cumbersome but offer slightly better security. [1] In 1929, Lester S. Hill developed the Hill cipher, which uses matrix algebra to encrypt blocks of any desired length. However, encryption is very difficult to ...

  4. Lester S. Hill - Wikipedia

    en.wikipedia.org/wiki/Lester_S._Hill

    Lester S. Hill (1891–1961) was an American mathematician and educator who was interested in applications of mathematics to communications.He received a bachelor's degree (1911) and a master's degree (1913) from Columbia College and a Ph.D. from Yale University (1926).

  5. Puzzle solutions for Friday, Nov. 29, 2024

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    Celebrity Cipher "I was about to write that in the future I would choose my words more carefully, but I'm sure I won't." ... Online Crossword & Sudoku Puzzle Answers for 11/29/2024 - USA TODAY ...

  6. Puzzle solutions for Wednesday, Oct. 23, 2024

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    Celebrity Cipher "We need storytelling. Otherwise life just goes on and on, like the number pi." ... Online Crossword & Sudoku Puzzle Answers for 10/23/2024 - USA TODAY. Show comments. Advertisement.

  7. Puzzle solutions for Saturday, Aug. 31, 2024

    www.aol.com/puzzle-solutions-saturday-aug-31...

    Celebrity Cipher "That's the last time I let Wesley Snipes help me out with my taxes!" − Comedian Chris Tucker ... Online Crossword & Sudoku Puzzle Answers for 08/31/2024 - USA TODAY. Show ...

  8. Category:Classical ciphers - Wikipedia

    en.wikipedia.org/wiki/Category:Classical_ciphers

    This page was last edited on 22 October 2024, at 17:12 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  9. National Cipher Challenge - Wikipedia

    en.wikipedia.org/wiki/National_Cipher_Challenge

    The part B challenges are intended to be harder. These begin with relatively simple substitution ciphers, including the Bacon cipher and Polybius square, before moving on to transposition ciphers, Playfair ciphers and polyalphabetic ciphers such as the Vigenère cipher, the Autokey cipher and the Alberti cipher.